Malicious PDF — malware analysis report

Static analysis result for SHA-256 6767a28d9b686ad7…

MALICIOUS

PDF

90.5 KB Created: 2021-03-31 18:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8314f4e31dd5847f1bf4563696cf9f3b SHA-1: 343f915ab3831af271b0376a5f5f582e74c920a6 SHA-256: 6767a28d9b686ad70378995e087c97c9c29da10d68484f535e2447e492cd8172
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute potentially unwanted software or lead to phishing sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document body, though heavily obfuscated, contains references to 'werewolf online mod apk', indicating a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/123?utm_term=werewolf+online+mod+apk+0.+28.+5 PDF link annotation
    • http://mimivamefigupe.sportsontheweb.net/angles_of_depression_and_elevation_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/jgjgNii/36588652698.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5ff0bfe50690c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370987/normal_5fe18fb242bb2.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ibUSjea/r-_type_dimensions_pc_descargar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378856/normal_5feb9535bba63.pdfIn PDF document text
    • http://zozegakipuvi.iblogger.org/salario_policia_federal_df.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/irregular_plurals_worksheet_first_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/egchhij/71252328666.pdfIn PDF document text
    • https://cdn.sqhk.co/lilovenodi/zyhgHgj/wikevudemu.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/g6yjjjT/history_channel_vikings_season_5_episode_11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_603c7fc1c3b3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_c3caa1bb91f8441690c12bf447e1cdb5.pdf?index=trueIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_e1d724e6b1134d359ffbb30ec4486b9f.pdf?index=trueIn PDF document text
    • http://xezabesazigida.epizy.com/korg_sustain_pedal_not_working.pdfIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_d3b7586cc96b48eb8614dab66fbcb457.pdf?index=trueIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_f44287b1301e4554a06a7994dca8212a.pdf?index=trueIn PDF document text
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_1f88907094444f3dba4f73ccbf2565d9.pdf?index=trueIn PDF document text
    • https://6dca1d0c-b102-4aa4-a312-d013f97c39dd.filesusr.com/ugd/fb87fb_fc1b28ba65ac4ea6b2a86551928cd7dd.pdf?index=trueIn PDF document text
    • http://mogigolutatuliz.rf.gd/jurnal_acacia_mangium.pdfIn PDF document text
    • http://tiwowuda.epizy.com/45288239920.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_3b1d401f97ee470e821803bb7e6c3e3b.pdf?index=trueIn PDF document text
    • http://vexabimumemig.atwebpages.com/benefits_of_community_gardens.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 5804 bytes
SHA-256: 3df59d33a9fbbcd8e2411b0adfee7cc02960d7f972239cbd89f68cdd76f19504
font_01_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 6612 bytes
SHA-256: 1f471ee8d8d9ca398e5e9898cf546bb24bab2c57b95a19da76ebb3e7ed95820e
font_02_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 10624 bytes
SHA-256: dfcae48bb0024a5509666b749ef3d6fc209a9fd352613dbe527b623bd7fc5faa
font_03_sfnt_off00014623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14623 16384 bytes
SHA-256: 226a8e4e528c820945b068501793868e9b71e899c703a7ad804f9a2f424011a5